That is wierd, because my last tank was indeed a 75 gallon reef and I did have a flame and a coral beauty. They were the same size and did great together other that the flame would chase the beauty. He never did any damage though. The wierd thing was that the flame was added second and became the aggressor.

I have an urchin also... a freebee hitchhiker. I want coralline growth and did not realize that a single urchin could do much to effect that. It started out about the size of a quarter and now a few months later is a good 2.5 inches. When you say it keeps your tank clean... do you mean you have zero coralline? I hope as mine continues to grow that is not the case... I love the color that the coralline adds to my tank.

my urchin does not bother my corals or fish. However he does keep almost 300 lbs of live rock in a 100 gallon tank completely free of coralline. I dont like it, but my mom gave it to me and I would hate to get rid of it. Its just one thing I have to live with, no coralline .